I never got Marshmallow for it via OTA updates.
(J500H)
How could they update it to Nougat?
But at some point I had managed to flash a Korean Marshmallow though I rolled back to Lollipop after some days.

So in short, there's a possibility that my phone will get it, too, but I wish Asus will not abandon my unit.
I'm still glad that they support mine still, with the March 1 2017 security update - not the latest, but better than not, right?